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Eph/ephrin interactions modulate vascular sympathetic innervation.

Deborah H Damon¹, Jaclyn A teRiele, Stephen B Marko

¹Department of Pharmacology, University of Vermont, 89 Beaumont Avenue, Burlington, VT 05405, United States. Deborah.Damon@uvm.edu

Autonomic Neuroscience : Basic & Clinical

|July 20, 2010

Summary

Eph/ephrin interactions influence vascular sympathetic nerve growth and function. EphA4 specifically reduced artery reinnervation and increased norepinephrine release, highlighting their role in vascular innervation.

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Published on: September 11, 2018

Area of Science:

Neuroscience
Molecular Biology
Cardiovascular Research

Background:

Eph and ephrin proteins are crucial for axon guidance and neuronal function.
Their role in vascular sympathetic innervation remains largely unexplored.

Purpose of the Study:

To investigate the role of eph/ephrin interactions in the growth and function of vascular sympathetic innervation.
To determine if eph/ephrin signaling affects sympathetic nerve regeneration and neurotransmitter release in blood vessels.

Main Methods:

RT-PCR analysis of eph and ephrin expression in rat sympathetic ganglia and arteries.
In vitro binding assays using dissociated sympathetic neurons.
Assessment of femoral artery reinnervation in the presence of ephA4-Fc or IgG-Fc.
Measurement of norepinephrine release from isolated tail arteries.

Main Results:

Both eph and ephrin families (A and B) are expressed in sympathetic neurons and vascular tissues.
EphA4 significantly inhibited the reinnervation of denervated femoral arteries.
EphA4 enhanced basal norepinephrine release from sympathetic nerve terminals in tail arteries.

Conclusions:

Eph/ephrin interactions play a significant role in modulating the growth of vascular sympathetic innervation.
EphA4 acts as an inhibitor of sympathetic nerve regeneration in arteries.
Eph/ephrin signaling impacts the functional activity of vascular sympathetic nerves, affecting neurotransmitter release.